我如何在React中使用App.tsx代替App.js？

Question

我已经按照文档中的说明创建了一个React项目，该文档自动将App.js文件添加到了该项目中。我的问题是我想使用App.tsx而不是App.js。由于某些原因，我无法运行App.tsx文件。我该如何解决？

我已经读过 this question asked here，但由于它对我没有任何意义，因此我无法使用它，因为这是我的第一个带有react的项目。

这是我的文件夹结构。

在此图像上可以看到，将App.js文件注释掉时，浏览器出现错误。

这是index.js文件，未更改。

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import * as serviceWorker from './serviceWorker';

ReactDOM.render(<App />, document.getElementById('root'));

serviceWorker.unregister();

这是package.json文件

{
  "name": "dualnback",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^4.2.4",
    "@testing-library/react": "^9.4.0",
    "@testing-library/user-event": "^7.2.0",
    "@types/lodash": "^4.14.149",
    "@types/material-ui": "^0.21.7",
    "atob": "^2.1.2",
    "bcryptjs": "^2.4.3",
    "body-parser": "^1.19.0",
    "bootstrap": "^4.4.1",
    "concurrently": "^5.0.0",
    "cookie-parser": "^1.4.4",
    "cors": "^2.8.5",
    "express": "^4.17.1",
    "express-session": "^1.17.0",
    "express-ws": "^4.0.0",
    "hammerjs": "^2.0.8",
    "jsonwebtoken": "^8.5.1",
    "lodash": "^4.17.15",
    "material-ui": "^0.20.2",
    "mongoose": "^5.7.8",
    "morgan": "^1.9.1",
    "passport": "^0.4.0",
    "passport-jwt": "^4.0.0",
    "passport-local": "^1.0.0",
    "react": "^16.12.0",
    "react-dom": "^16.12.0",
    "react-router-dom": "^5.1.2",
    "react-scripts": "3.3.0",
    "reactstrap": "^8.2.0",
    "rxjs": "~6.4.0",
    "rxjs-compat": "^6.5.3",
    "tslib": "^1.10.0",
    "typescript": "^3.7.3",
    "websocket": "^1.0.30",
    "zone.js": "~0.9.1"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  },
  "devDependencies": {
    "@types/react-router-dom": "^5.1.3",
    "@types/reactstrap": "^8.2.0",
    "react-router-dom@next":"*"
  }
}

Answer 1

您可能只需要安装相关的类型库。

npm install --save @types/react @types/react-dom

尝试一下。